Seal leakage analysis of large-diameter gasket flanges
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Today, I read the magazine \"Pressure Vessels\", which contained a paper titled \"Sealing and Leakage Analysis of Large-Diameter Liner Flanges\". The main topic of the paper was related to the use of liner flanges and gaskets in large-diameter equipment. The paper concluded as follows: 1. For large-diameter long-neck butt-welded flanges (DN≥2500), it is recommended to use a surfacing structure for the sealing surfaces； 2. For the selection of gasket materials for large-diameter equipment flanges, since it is difficult to manufacture metal rings for wave-patterned gaskets, wound gaskets are recommended. Regarding these two conclusions, for the first one, this is indeed what we did in our design; generally, a liner ring structure is not recommended for high temperatures, medium to high pressures, or in vacuum conditions. But as for the second point, I hadn’t paid attention to it before – I’m not sure what maximum diameter such wave-shaped gaskets can achieve Is it truly true, as stated in the text, that when the diameter is large (DN≥2500), the splicing of metal rings cannot ensure the sealing performance of the wave-shaped gasket? Experienced colleagues, please give some advice. I scanned it with my phone; those who need it can take a look.
Articles of this kind can only be used as a reference and should not be taken entirely at face value; both the manufacturing of large-diameter toothed gaskets and wound gaskets presents difficulties. Moreover, large-diameter flanges also present difficulties in bolt pre-tensioning; therefore, the problems are multifaceted and cannot be considered from just one perspective
In our design specifications, we stipulate that for DN > 1500, a surfacing-welded sealing surface is to be used (a gasket ring structure was also used in the past, and leaks occurred); for DN 2000 and above, wound gaskets are to be used, rather than wave-shaped gaskets. For reference.
Well, yes. As long as the diameter is large, these sealing problems will definitely exist. So I’d like to see what everyone does to try and avoid seal leakage
The first point is fairly acceptable. The second point is to consider the manufacturer of the gasket. Processing the metal rings of large-diameter wave tooth pads is indeed challenging, but in order to enhance their competitiveness and gain a foothold in the market, some manufacturers have made breakthroughs in these areas.